There are no MUST HAVES or OMG YOU CAN'T LIVE WITHOUT THIS APP type of thing on a andriod.
Just pick what you want and run with it. These new phones have so much memory and processing power, it's hard to really really slow them down. They make a one touch "off" or "close out" for any app that is open but not being used.
I'm not someone that is super attached to my phone, like I don't need it in my hands 24/7 type of thing so my battery lasts like 3-4 days sometimes before I see 15-20%. But if I use pandora, it sucks it down kinda fast.
